GB/T 14294-2026 Central-station air handling unit English, Anglais, Englisch, Inglés, えいご
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ICS 13.220.10
CCS H 57
National Standard of the People's Republic of China
GB/T 14294-2026
Replaces GB/T 14294-2008
Central-station air handling unit
组合式空调机组
Issue date: 2026-01-28 Implementation date: 2027-02-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Classification and Designation
5 General Requirements
6 Requirements
7 Test Methods
8 Inspection Rules
9 Marking, Packaging, Transportation and Storage
Appendix A (Informative) Test Method for Airborne Sound Insulation Performance of Unit Casing
Appendix B (Normative) Test Method for Air Flow Rate, Air Pressure, Input Power, and Specific Fan Power of Units
Appendix C (Normative) Field Test Method for Air Flow Rate, Air Pressure, Input Power, and Specific Fan Power of Units
Appendix D (Normative) Test Method for Cooling Capacity, Heating Capacity, Cooling Energy Efficiency Ratio, and Heating Coefficient of Performance of Units
Appendix E (Informative) Field Test Method for Cooling Capacity, Heating Capacity, Cooling Energy Efficiency Ratio, and Heating Coefficient of Performance of Units
Appendix F (Normative) Test Method for Casing Deformation Rate of Units
Appendix G (Normative) Test Method for Air Leakage Rate per Unit Area of Unit Casing
Appendix H (Normative) Test Method for Filter Bypass Leakage Rate of Units
Appendix I (Normative) Test Method for Casing Thermal Transmittance and Thermal Bridging Factor of Units
Appendix J (Normative) Test Method for Air Outlet Noise of Units
Central-Station Air Handling Units
1 Scope
This document specifies the classification and designation, general requirements, technical requirements, test methods, inspection rules, as well as marking, packaging, transportation, and storage for central-station air handling units (hereinafter referred to as "units").
This document applies to units where water or steam is used as the medium in the coils. Units using brine or aqueous glycol solutions as refrigerants, units using direct expansion coils, and units using electric heaters may refer to this document for use.
2 Normative References
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 191 Packaging – Pictorial marking for handling and storage of goods
GB/T 1236-2017 Industrial fans – Performance testing using standardized airways
GB/T 3767-2016 Acoustics – Determination of sound power levels and sound energy levels of noise sources using sound pressure – Engineering methods for an essentially free field over a reflecting plane
GB/T 3785.1-2023 Electroacoustics – Sound level meters – Part 1: Specifications
GB/T 6165 Test method for the performance of high efficiency particulate air filter – Efficiency and resistance
GB/T 6388 Transport package shipping mark
GB/T 6881-2023 Acoustics – Determination of sound power levels and sound energy levels of noise sources using sound pressure – Precision methods for reverberation test rooms
GB/T 9068-1988 Determination of sound power levels for noise emitted by heating, ventilating and air conditioning equipments – Engineering method
GB/T 13554-2020 High efficiency particulate air filter
GB/T 14295-2019 Air filter
GB/T 14296 Air coolers and air heaters
GB/T 15173-2010 Electroacoustics – Sound calibrators
GB/T 16803 Terms of heating, ventilation, air conditioning and air cleaning equipment
GB/T 17697 Acoustics – Determination of sound power radiated into a duct by fans and other air-moving devices – In-duct method
GB 18613-2020 Minimum allowable values of energy efficiency and energy efficiency grades for motors
GB 19761-2020 Minimum allowable values of energy efficiency and energy efficiency grades for fans
GB/T 21087 Heat recovery ventilators
GB/T 29736 Air conditioner using humidifiers
GB/T 34012 Air cleaning devices for ventilation system
GB/T 37292 General technical requirements for air enthalpy test facility
GB/T 41318 Silencers for ventilation
JG/T 436 Motorized damper for building ventilation
NB/T 10463-2020 Minimum allowable values of energy efficiency and energy efficiency grades for variable speed drives
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 16803 and the following apply.
3.1
central-station air handling unit
Air handling equipment assembled from one or more functional sections of the unit.
3.2
functional section of the unit
A unit body that performs one or several air treatment functions.
Note: Functional sections include unit bodies for air mixing, flow equalization, filtration, cooling, heating, dehumidification, humidification, supply fan, return fan, exhaust fan, spray washing, sound attenuation/silencing, heat recovery, sterilization, etc.
3.3
standard air
Air at a temperature of 20°C, relative humidity of 65%, atmospheric pressure of 101.3 kPa, and density of 1.2 kg/m³.
3.4
rated value
The performance value of the unit under the test conditions specified in the standard.
3.5
nominal value
The performance value of the unit under the test conditions declared by the manufacturer.
Note: Performance values for which the manufacturer has not declared test conditions are considered rated values.
3.6
rated air flow rate
The volume flow rate of air passing through the unit per unit time under the test conditions specified in the standard.
Note: The unit is cubic meters per hour (m³/h).
3.7
unit external static pressure
The static pressure difference between the outlet and inlet of the unit, after overcoming its own resistance.
Note: The unit is Pascal (Pa).
3.8
unit external total pressure
The difference between the total pressure at the unit outlet and the total pressure at the unit inlet.
Note: The unit is Pascal (Pa).
3.9
unit total static pressure
The sum of the unit's own resistance and the external static pressure.
Note: The unit is Pascal (Pa).
3.10
face velocity uniformity
The percentage of total measurement points where the absolute difference between the air velocity at any point on the unit's cross-section and the average velocity does not exceed 20% of the average velocity.
Note: Expressed as a percentage.
3.11
specific fan power
The ratio of the unit input power to the air flow rate.
Note: The unit is watt-hour per cubic meter [W/(m³/h)].
3.12
cooling capacity
The total heat extraction (including sensible and latent heat extraction) by the unit under specified test conditions.
Note: The unit is kilowatt or watt (kW or W).
3.13
heating capacity
The total sensible heat supplied by the unit under specified test conditions.
Note: The unit is kilowatt or watt (kW or W).
3.14
cooling energy efficiency ratio
EERAHU
Under specified test conditions, the ratio of the sum of the unit's cooling capacity and air conveying capacity to the sum of the unit's measured input power and the equivalent electrical power converted from the measured water-side pressure drop.
Note: The unit is watt per watt (W/W).
3.15
heating coefficient of performance
COPAHU
Under specified test conditions, the ratio of the sum of the unit's heating capacity and air conveying capacity to the sum of the unit's measured input power and the equivalent electrical power converted from the measured water-side pressure drop.
Note: The unit is watt per watt (W/W).
3.16
casing deformation rate
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and designation
5 General requirements
6 Requirements
7 Test methods
8 Inspection rules
9 Marking, packaging, transportation and storage
Annex A (Information) Test methods for sound insulation performance of casing
Annex B (Normative) Test methods for air flow rate, air pressure, input power and specific fan power air per volume flow rate of the unit
Annex C (Normative) Field test methods for air flow rate, air pressure, input power and specific fan power air per volume flow rate of the unit
Annex D (Normative) Test methods for cooling capacity, heating capacity, cooling energy efficiency ratio and heating coefficient of performance of the unit
Annex E (Normative) Field test methods for cooling capacity, heating capacity, cooling energy efficiency ratio and heating coefficient of performance of the unit
Annex F (Normative) Test methods for casing deformation rate of the unit
Annex G (Normative) Test methods for air leakage per casing area of the unit
Annex H (Normative) Test methods for filter bypass leakage rate of the unit
Annex I (Normative) Test methods for heat transfer coefficient and thermal bridge coefficient of the casing
Annex J (Normative) Test methods for unit noise transmitted by the unit into the air openings
